Process of dyeing silk



Patented July 12, 1927 UNITED STATES EUGENE L. MAU'PAI, NEW YORK, N. Y.

PROCESS OF DYEING SILK.

No Drawing.

This invention relates to an improvement in the dyeing of colors that will be absolutely fast tohoiling soap solution and fast to peroxide of hydrogen bleach (such as is commonly. used in the textile dyeing plants) also fast to perspiration, on silk piece goods and skein silk, with dyes such as chromogene, ,autochrome, indigosol or similar dyes that can be employed with the addition of a metallic salt, such as bichromate of potassium, or copper sulphate, in the same bath or in a separate bath after dyeing. The chromogene and autochrome dyes referred to above are monoazo dyes, while the indigosol is an indigoid dye. v

I-Ieretofore no successful way has been found of dyeing-silk piece goods or skein silk absolutely fast, with such dyes as stated above, and furthermore I have found-that silk could not heretofore be successfully dyed with the above named dyes and metallic salts in the same bath as the colors would not come out with any degree of brilliancy. By my improved process as will presently be described, I am able to dye silk any shade absolutely fast to a boiling soap solution.

The process is conducted as follows: The silk piece goods or skein silk are treated in a bath containing the chromogene or such similar colors, in accordance with the shade desired, with the addition of from 3 to 10% acetic acid or 3 to 5% sulfuric acid, depending upon the color. Thedyebath is started cold and gradually raised to aboiling point temperature, whereupon 3 to 5% ofa metallic salt such as above, is added.

The goods are worked in this mariner for about 30 minutes and then gradually brought to a boil within about 40 minutes. After the dyeing process and the treatment with the'metallic salt the skein silk or piece goods are thoroughly rinsed and there- 'upon entered into a boiling, highly concentrated soap solution at approximately boiling point, by which the coloris developed.

The silk may be first dyed in a bath with either a chromogene or autochrome or indigosol dye or such dyes that will stand metallic salt treatment, or in a separate bath of metallic salts, after dyeing with above colors. Then the colors are developed described.

and fixed by the soap boiling process above Application filed February 1 1926. Serial No. 85,380.

Summarizing my process I employ the following steps:

A. Dyeing the silk with either of above dyes or similar ones;

B. Treating the silk in the same dyebath with a metallic salt, or applyin the metallic salt in a separate bath after yeing.

C. Rinsing the silk after the metallic salt treatment; and finally D. Boiling the silk in a highly concentrated soap solution, which develops and fixes the colors.

Wherever in the claims Iirefer to any of the dyes mentioned in the specification, I

intend that any dye of like character may be substituted as an equivalent.

By my invention I am able to dye silk piece goods or skein silk any shade, the color being absolutely fast to boiling soap solution and peroxide hydrogen bleach, and the processapplies to both colors and black.

Having now described my invention, what I claim is:

1. A step in the process of dyeing silk with a dye of the class including chromogene, autochrome, and'indigosol, and a metallic salt having oxidizing properties, which comprises redeveloping previously dyed silk in a highly concentrated boiling soap solution.

2. A process of dyeing silk with a dye of the class including chromogene, autochrome, and indigosol, which comprises treating the dyed silk with a metallic salt having oxidizing properties, and finally developing the silk with a highly concentrated soap solution. 1

3. The process of dyein silk material with a dye of the class inc uding chromogene, comprises first subjecting the silk to the action of a bath containing a metallic salt having oxidizing properties, then boiling the silk in this bath at the boiling point, then rinsin the silk, and finally developing the color ma highly concentrated boiling soap solution.

4. The process of dyeing silk with a dye of the class including chromogene, autochrome, and indigosol, which comprises treating the silk in the dyebath with a metallic salt havin oxidizing r0 erties, and

finally boiling t e silk in a 'g ly c0noen-- autochrome, and indigosol, which traited soap solution to develop and fix the co or. V

5. The process of dyein silk with a dye of the class including o romogene, autochrome, and indi 0301, which comprises applying a metallic salt having oxidizing properties in a se arate'bath, after dyeing, rinsing the silk a or the metallic salt treatment, and finally boiling the silk in a hi hly concentrated soap solution to deve op and fix the color.

6. Silk dyed with a dye of the class in- 

